I did not get a link (I don't always get success doing so anyway remember, computer idiot here) BUT yesterday, there was a guy in the Farm&Garden section on Chicago CL, had 3 seperate but grouped right together, ads for NOS gas tanks (at least 2 different styles among the 3 ads) built by a company called Chilton out of Wisconsin, NOS from 1971 sounds lik he has pallets of them, says he would ship within the ad, only $25 each. The one, 1-gallon one looked like what would have come on either a Tecumseh HH series cast iron engine or a Kohler. Steel, threaded fuel tank outlet. I know that I have one here that I have way more than that into, in de-varnishing and coating to prevent future rust within. Where was he when I did the post last year asking how people here flush and clean their gas tanks? This adds another affordable option; toss into scrap and get a new one.
The ad did say "will ship, send me your ZIP for shipping quote".